GE Power Management
LPS-D Line Protection System
5-
19
5 FUNCTIONAL TESTS (FACTORY SETTINGS)
5.4 PHASE-TO-PHASE ZONE REACH TESTING
5
5.4.3 T18 – ZONE 3 PHASE REACH, M3 FAULTS
1.
Protection Settings:
Z1DISTANCE
(101)
Z1PHASE = NO
(104)
Z1GROUND = NO
Z2DISTANCE
(201)
Z2PHASE = NO
(204)
Z2GROUND=NO
Z3DISTANCE
(301)
Z3PHASE = YES
(304)
Z3GRND = NO
Z4DISTANCE
(401)
Z4PHASE = NO
(405)
Z4GRND = NO
OVERCUR
(601)
50 = NO
(605)
50G = NO
(610)
51G = NO
OS BLOCKING
(1603) BLOCKWHAT = 3 (BLKNONE)
2.
Connect the relay as shown in Figure 5–1: PHASE-TO-PHASE TEST CONNECTIONS on page 5–7 for
the appropriate phase under test. Set the relay to test mode 32 (Any Zone 3 Phase). The LUI displays:
ANY Z3 PHASE ON
3.
Set the voltage inputs as follows: VA: 67 V rms
∠
0°, VB: 67 V rms
∠
–120°, VC: 67 V rms
∠
+120°.
4.
Set the fault current,
I
op
, to the phase-angle value listed below. Note that the leading phase angle is 180°
out of phase with the line to which it is shorted (increase VA, VB, and VC to 75 V when
∠
I
op
= –55°).
5.
Set the fault current to 5.0 (1.0) amperes rms. Simultaneously reduce the voltages of the faulted phases
and check that the A1 contact closes when the voltages are within the limits shown above.
6.
Reduce the fault current to zero. Note that the trip target indication concurs with the fault. For example, an
AB fault is displayed as:
TRIP: AB Z3 "DIST"
where “DIST” is the displayed target.
7.
Repeat the test for phase BC and CA faults.
I Degrees
Volts rms
Displayed Target
†
–25
56 to 63
–
–55
65 to 73
195 to 205
–85
56 to 63
–
†
Reference only
Содержание LPS-D
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